Merge branch 'dev' into f-anonymous-user

src/main/java/caosdb/server/ServerProperties.java

...db/server/accessControl/AnonymousAuthenticationToken.java

...main/java/caosdb/server/accessControl/AnonymousRealm.java

src/main/java/caosdb/server/database/BackendTransaction.java

...ckend/implementation/MySQL/MySQLInsertEntityDatatype.java

...backend/implementation/MySQL/MySQLInsertSparseEntity.java

...database/backend/interfaces/InsertEntityDatatypeImpl.java

...r/database/backend/interfaces/InsertSparseEntityImpl.java

...sdb/server/database/backend/transaction/InsertEntity.java

...er/database/backend/transaction/InsertEntityDatatype.java

src/main/java/caosdb/server/scripting/CallerSerializer.java

src/main/java/caosdb/server/utils/Serializer.java